Mold-bearer-cutting machine



- L. W. CILAYBQURN IOLD BEARER CUTTING CHINE 'Much s, 19,29

Fned May 1e, 1927 3 Sheets-Sheet FOUNDATIONS ilk/1114112 i um.. m Vd n uu wu L Match 5, 1929. K L w, LAYBoURN 1,704,311

HOLD BEARBR CUTTING lIiAGHINE Filed May 16, 1927 5 Sheets-Sheet 2 March5, 1929. L.. w. CLM/Bouma` IOLD BEARER CUTTING MACHINE Filed may 1e,1927 s sheets-sheer 3 Iigl 7 F* /44 4.3 /4/ 14a 5/ ff /44 .vphj /35 1FM/34 32 mi? .sa J3 /39 o v. [32 o* u /33 19t-- o -319 o 69 I POUPDATIGMsa sa V 'ifik 5 /04 la, j v v 2. 94 E x55.

Patented Mar. 5, 1929.

LESLIE W. C'LAYBOURN, OF MILWAUKEE, WISCONSIN.

MOLD-BEARER-CUTTING MACHINE.

Application led May 16,

It is the object of my invention to provide means whereby to cut bearersin a mold for a printing plate, in order that the printing plate formedfrom such mold may be equalized throughout its area for resistance topressure and bending forces applied to the printing plate. My inventionis exemplified as operating upon a so-called Wax mold, although it isobvious that the material of which the mold is composed is notrestrictive upon my invention.

It is a practice of the modern making of printing plates to exertpressure upon the printing plate While the printing surface thereof isresisted bv a smooth hard surface,

in order to bring the various printing surfaces of the printing plateinto the same plane, whether the plate be flat or curved, the planeinthe instance of curved plates being a cylindrical plane,and it is alsothe practice to bend arflat printing plate in order to form a curvedprinting plate suitable for instance for application to a plate cylinderof a rotary printing press.

Many printing plates are provided with printing portions in only a partor in separated parts of the area thereof, and many other printingplates are provided With printing portions which are more Compact,

or in which the printing lines are broader,

in some portions of the printing plate thanA in others, with the result,when pressure is applied to compress the printing plate, or to press allparts of its printing portions into the same plane, that unevenresistanees to the pressure forces are found in different parts of theprinting plate, those parts with light, few or separated printingsurfaces being obliged to resist the saine pressures as those parts withmore condensed printing surfaces, or larger printing areas, inconsequence of which the light or separated printing surfaces and theedges of printing areas are unduly pressed, and a printing plate isproduced which is not perfect.

It has also been :found that upon bending stresses being applied toprinting plates having unequal or unbalanced areas of printing portions,that unequal resistances to said bending stresses are found in thevarious portions of the print-ing plate, depending on the unevenness ofthe distribution of the printing surtaizes thereon, .and a eurwd claims.

19a?.` serial No. 191,915.

printing plate is produced which is irregular 1n its curvature, or inthe location of all its printing surfaces in the same cylindrical plane.l

The form from which a mold is made is usually composed of type, cuts andthe like, or previously made printing plates, or any one or more ofthese. The form is usually surrounded by a marginal line of bearers,these bearers being primarily for the purpose of preventing shifting ofthe `form on the mold when pressure is applied between the forni and themold, forcausing indentations or depressions in the mold of the printingportions and the bearers# i It is the object of my invention to providemeans whereby the` mold, in which `auch depressions ot printing portionsare made, with additional ora-informed bearer depressions in theimprinting portions of the mold, so that, Whenithe printing plate hasbeen formed from such mold, as by electrodepositing, casting or otherprocess, or one or more of the same, there are printing areas and bearerareas of equal height Well distributed throughout `the rinting plate,for forming theprinting pate at its various portions of equal thicknessin order to resist i pressure, bendinor stress, or the like, tosubstantially equal extent `throughout the area of the printing plate. Y

The printing depressions formed in molds are in practice of differentdepths in `different molds, depending on the solidity, openness orextentof the printing areas `in the form, and the pressures `applied in`forming the mold therefrom. It is `the object of my invention further`to provide novel means whereby `to gagethedepthof the cutter fortorniing the `aiterdiorrned bearer depressions in the mold; further, toprovide novel `means fou determining the cutting relation of the Cuttingtool to the mold; further, to provide novel means foreontrolling theoperative relation between the` cutting tool and the mold; and,further,to providenovel means for providing coactiva movements betweenthe cutting tool andthe mold. The invention will beifurther readilyunderstood from the `following description and and from `the drawings,in which lattermW` l Fig.' i `iaajplau view `et n. mold having lilltherein areas of printing portions and areas ot' imprinting' portions asheretofore usually constructed.

Fig. 2 is a cross-section ot the saine7 taken on the line 2 2 of F ig.1.

Fig. 3 is a cross-section ot the saine, taken on the line 3-3 oi Fig'.1.

Fig'. 4: is a plan view et the saine, showingl the mold after being;operated upon by my improved device.

Fig. 5 is a eroi etion ot the saine, taken on the line 5--5 oit Fig. et,showing the atten torined bearer-d@pressions in the mold.

Fig. 6 is a eressseetion ot the saine, talren on the line (3(3 et Fig'.Il.

Fig. 7 is a plan viewY oit a printing plate, which may be anoleetrotype, made troin the inold shown in Fips. 1, 2 and Fig'. 8 is across tion of the saine, taken on the line 88 oit Fig. 7.

Fig'. 9 is a cross-section ot the saine, 'taken on the line 9 9 of Fig.7.

Fig. 10 is a plan View et a printing plate made from a mold shown inFigs. ll, 5 and 6, having my invention applied thereto.

Fig. 11 is a crossjsection of the saine, taken on the line 11-11 of Fig.10.V

F ig. 12 is a cross-section et the saine, taken on the line 12-12 ofFig. 10.

Fig. 13 is an enlarged detail et the latter;

Fig. 1l is a trent elevation oi" iny improved device.

Fig. 15 a side elevation et the saine, partly breken away.

Fig'. 16 is a fragmentary rear elevation et the saine.

F ig. 17 is a plan view otl the saine.

Fig. 18 is a vertical longitudinal section of the saine, taken on theline 18-18 of Fig. 17, and partly broken away.

F 19 is a fragmentary vertical crosssection of the saine, `talrcn on theline 19-19 ot Fin'. 17.

Fig'. 20 is a cross-section ot the saine, taken on the line 20--20 ofFig. 19.

File'. 21 is a detail of the positioningA nieans for the cutter, takenin section in the plane oit the line 21%21 of Fig. 18.

22 is a cross-section of the saine, taken e plano oli the line 22.22 ofFin. 1 8. Fig'. 2?) is a detail of the stop for the cut i talien insection on the lino '7 i ig. lli.

Figi'. 2t is a side elevation ot the cutter in its socket, the latter'shown in vertical section; and,

Fia'. 25 is a cross-section ol' the saine, taken on the lino 25-25 ofFig'. 24.

The printing' plates may be electi'otypes, stereotypes, or printingplates otherwise termed, or termed et different material. The printingplate 31 is exemplified as an electrotype, (see Figs. 9 and 13), whichcoinprises an electro-deposited shell 32 and a backing 83 of metal castin the shell;

In the modern practice et correcting printing plates it is usual tosupport the print inp,1 surface of the printing plate by a smooth hardsurface and to apply pressure to the printing' plate for bringing allthe printing surfaces thereolI into the saine plane, as shown, describedand claimed ttor instance in United States Letters Patent llo. 1,549,-185, granted to nie August 11, 1925, 'lor iinproveinents in method etcorrecting printing plates and printing plates produced thereby.

It has been found, in applying pressure upon a printing' plate which hasunbalanced areas et printing,` surface, that those portions et theprinting plate, at 311-, which have restricted or small areas otprinting,r surface, and the edges 35 of printing portions of theprinting' plate adjoining;` imprinting` portions, are less resistaiit tothe pressures applied to the printing plate, than the printing portionsthereof, at 36 (Fig. 7), which here greater aree-.s oit printingsnritaee, with the result that such portions ot less resistance arelikely to be and often are deformed llt) oi' spread, in a manner to mai'the excellence of the printing plate.

It has also been found, in curving printing' plates thus formed withunbalanced printing areas, that the thicker portions oli the printingplate resist the bending` stresses to greater extent than the thinnerport-ions, resulting; in a curved printing' plate in which theprintingI1 surfaces are not in as true eylindrical Jforni as they shouldbe, or in which the curvature et the printing` plate is ii'- i'egular.

In oi'der to avoid these objections, l provide the imprinting' portionsol" the print ing plate, as at- 37, (Figs. 7, 8 and 9), with additionalthickness so as to balance the resistanees of the printing platethrougliout its area. l accomplish this by providing the printing; platewith additional bearers in the unprinting portions thereof, or in thespaces adjacent to the printing portions, as exemplified by the raisedportions or bearers 238 in the printinfrj,r plate. (See Fins. lll, ll,12 and 13.) i

These bearers aid in resisting; the prow-ure applied to the i'irinting'plateiii correcting' the saine, and aid in. resisting' the licnilini;lstresses when curving; the pi'iutiunj plate. so that excess pressure istaken oli ot the isolated printing,` parts ot the printing' plate, andcrushiufr. (lelii'iniiip' or niutihition ther ai led, and se that aiiniforni hotly Ytor the printing plate is provided in which therrsistance to bencliri.Q is sulistantially evenly distributed forenabling a unitorin curvature to be applied to the plate.

After the printing plate has been con rented, or curved, and otherwisecoii'ipleled1 as the ease may he, the ext-ra hea" "s are rcmoved byrouting', or in other de. .alile inanmossi 1 ner, for instance, to thedotted line 39 .inFig 13, so that the imprinting portions of theprinting plate are in properly low relation to the printing portions ofthe printing plate for proper inking and printing. The printing plate isformed from oi upon a mold, which has in it the reverse counter parts ofthe printing plate formed thereby.

The mold may be of suitable character, but is instanced as a usual waxmold 42, coinprising a layer or sheet of wax in which an impression ofthe printing form is made by pressure.r "this layer or sheet of Wax beinupon a backing sheeto't' metal. The mol as thus made. referringr toFigs. 1 to 3 inelusive, is instanced as embodying printing portions 2li,45, 4G, and imprinting portions 47, corresponding to the printingportions 34, 35, 36, and the imprinting portions 37 in the printingplate and corresponding portions in the forni from which the mold ismade. This forni is siii-rounded by a line of forni bearers, thedepressions of which are shown at 48 in the mold. These forni bearersare at theoutei margins o'l" the form and are provided primarily for theJurpose of preventing lateral shifting of the orni on the mold whenpressure is applied. The depths to which` the printing portions ofVditferent formsare pressed into their respective molds vary. p y

Thenever print-ing portions,A imprinting portions, and bearers or bearerportions of the mold are hereinafter mentioned, it will be understoodthat those portions of the mold are referred to from which the printingrportions, the imprinting portions and the bearers or bearer portionsrespectively of the printing plate are formed, these respective portionsin the mold being the reverse in elevation and direction of thecorresponding portions in the printing plate formed therefrom.

Then e1ni loying my improved. device I first form the mold with theusual printing areas, and the usual imprinting areas, the latter beingrepresented in the mold by the retained thickness of the materialof themold, or by leaving such portions of the mold unimpressed. i i

l provide the mold thus pre'lfiiirined. with after-torinedbezii-e1'depressions, which in the inold are represented by additionaldc- ]Aiiressions 51, (see Figs. 4, 5 and 6), formed in the niold byremoval of material therefrom to a depth equal to the depth of theimpressions oi' the printing characters in the mold. Fliesebearer-depressions may assume various shapes, and extend throughoutdifferent arcas.v depending on the arrangement and character of theprinting surfaces Which are formed in the mold by the printing form, theobject being to associate such printing portions oit' the mold thuspreforineilwitli after-formed `lifnirer-impressions of equal depthadjacent thereto, so as to relieve slight or separat-ed printing areasor characters in the printing plate formed from the mold of unduepressure, and `to transfer the resistances to such pressure to theadditional bearers thus formed in the printing plate as counterparts ofthe bearer-depressions thus formed in the mold.

It is desirable to form these bearer .depressions in the mold by removalof materials from the face side of the mold, and it is desirable thatthis removal shall be accurately accomplished so as to providebearerdepressions `which are equal in depth to the depth of the printingdepressions. `I prefer to accomplish this removal by `means of a cuttingedge of a cutting tool which is sunk into the imprinting portions of themold to a depth equal to the depth of the depressions of the printingcharacters in` said mold, and to cause travel between such cutting edgeand the mold so as to forma groove or grooves in said imprintingportions oi a depth equal to the depth of the printing depressions, thecutting tool removing the material of the groove or grooves past thesurface of the face Side ofthe mold.

This removal may be accomplished by a single passage between the tooland fthe mold, Wit-li the tool at extreme depth in the mold, namely inthe plane of the bottoms of the printing depressions, or `by a number ofsuch passages to remove the material of the mold in successive steps ineach of which the tool is deeper in the mold, until in the final passagethe tool is in the plane of the bottoms of the printing depressions inthe mold.

I prefer that thetravel between the `ciutting edge and the mold shall bein various directions, depending on the sha of printing areas adiacentto the imprintingr :portions and the extentiof such imprinting portions.

After the bearer depressions havebeen cut into a wax mold, any roughedges left by the cutting tool are smoothed or removed `loy themomentary application ot a `hot blast which melts such rough edges.

The apparatus exemplified comprises a bed 61, supported on a` suitablebase, shown comprising legs 62, rigidly secured to the base, and tiedtogether b tie-rods.

A carriage 65 is slidab e on guides `66 on the bed, the carriage being:provided with giiideways 67 complemental to the guides.

The mold 42is arranged to he rigidly held to the carriage so as to lieHat on the plane supporting surface ofthe carriagefas by means of clamps68. The carriage isprovided With an undercut groove 69,` in which a base7() provided with tongues is arran ed to slide. A clamping arm 71 ispivot to the base by a pin 72locat`ed in bearingsof i 1 lugs in the baseand in uthe arm, Aiscrew- ,y rod 73 is held downwardly by heeel beingreceived in a recess 74 in the base. The screw-rod passes freely througha hole 75 in the clamping arm. A nut 76 is received over the threadedportion of the screw-rod and has a handle 77 by means ot which the nutmay be readily turned for clamping the clamping shoe 78 et the clampingarm upon the mold, clamping the mold to the carriage. A spring 7 9between said arm and said base normally urges the clamping arm inunclamping direction.

A screw-rod 81 is journaled in bearings 82, 83, in the bed, and is heidendvfise therein by collars Sii, 85, pinned to the screw-rod. Ahand-wheel 8G and handle S7 thereon are arranged to turn the screw-rod.A nut 88 depends from and is lixed to the carriage and is threaded to te screw-rod. Rotation ot the screw-rod n.11 7es the carriage in onedirection or the other along the g es therefor on the bed according tothe direction ot rotation of the hand-wheel.

A cutter 91 having a cutting edge is arranged to coaet with the inold onthe e; rriage. The cutter is releasably secured to a eutterebar 93, asby insertion oit its shank 9d in a socket 95 in said cutter-bar, and theclamping oif said shank in said socket by means of a set-screw 90 havinga turning knob 97 thereon. Cutters having cutting edges of differentwidths or apes are arH ranged to be interchanged in cutting position onthe cuttersbar.

The cutting edge is adjustable toward and from the supporting face oi'Vthe mold for determining the depth of the cut to he made in the mold,and means are provided Ytor moving said cutting' edge toward and fromthe mold for moving the cutting edge into and out of the tace side ofthe mold, and means are provided for positioning the direction in whichthe cutting edge is presented for presenting the cutting edge in properrelation according to the direction et movement between the cutting edgeand the mold.

The cutter-bar is mounted in bearings 101, 102, on a slide 103; Thecutter-bar is positioned ondwise in said bear-in as by locating thebearings between a smulder 1041 on said bar'and a handle 105 iixed tothe oppo- .site `end of said bar. The cutter-bar is rotativeiypositioned in said bearings, and is provided with recesses 10G, whichrecesses are shown 90O apart. A bali 107 in a socket 108 in the wali otthe bearing 101 is normally urged toward said cutter-bar by a spring 109in said socket. The ball is received in said respective recesses tormaintaining the cutter-barili adjusted position during the cuttingoperation.

The slide 103 is mounted on a roeker-arin 111 and is adjustable toelevation thereon. A screw 112 is journaleo and held endwise in abearing 113 on a bracket 114 on said l. Si

slide, and is threaded into a threaded hole 115 in said arm. Thescrew-rod is provided with a handle 116 for ready rotation ot the saine.Rotation of the screw adjusts the screw up or down, according to thedirection ot rotation, `for positie-ning the cutting` edge. The slide isslidable in a guideway 117 in the arm. The slide is clamped to the armaitter adjustment by means oit a clampscrew 121 extending through a slot122 in the slide and threaded into a threaded hole 123 in the arm. Awasher 124 is received between the walls ot said slot and a head 125 on-Said :;ei'ew. A handle 120 is iiXed to Said head for manipulation oi thescrew.

The erin is pivoted to and adjustable lengthwi e o1'.i a screw-rod 131journaled in bearings 13 1153, upon brackets 13st, 135, extending 'fromthe bed. The screw-rod is held cndwise in said boarinijs by shoulders1313, 137, eoaeting with seid bearings. A hand-whcel 138 having a handle189 thereon is tired to saidf-1erew-rod tor rotating the saine. ilhcnthe screw-rod is rotated, the arm 111 is moved crosswise ot' the bed inone direction or the other, depending on the direction o1 rotation ofthe screw-rod.

The rocking movement of the rocker-arm is obtained by a bar 1411received in a fork 112 in said rocker-arm. The respective ends ot thebar are received in guideways 113 in the inner faces of brackets 1114extending from the brackets 134, 135. The rocker-arm nieves lengthwiseof said bar during the lateral travel oit said rocker-arm. The faces etthe bar coacting with the faces et the forli in said rocker-arm arepreferably rounded, as shown at 145, for accurate movement ot therocker-arm and close engagement between the engaging surfaces ot saidbar and said forli throughout the lateral positions and rockingmovements or the rocker-arm.

tops151 are provided at the respective ends et the bar. These stops areshown as clips for closing the upper ends of the guideways 143, and aresecured to the brackets 1fl-i by bolts 152. These stops limit the extentet movement oi' the cutting edge into the mold, and, with the adjustmentoit the cut-ter slide, determine the depth olf the cut made by thecutting edge.

Movement of the cutting edge out oi the lucid is obtained by theretracting more nient oi a treadle 155, on a treadle-levin' 150, whichis pivoted on a tie-rod 157 between the side trames ot the base, and isarticulated at 158 with a link 159. The link 150 has articulation at 160with an arm 101 fixed a rocker-rod 162 journaled in bearings 163 onbrackets 16d` extending from the bracliets 134, 135.

Rocker-aims 165 are fixed to the respec tive ends et said rechi-arendand havearn ticuletione 150 with links 167 having ertieit lations 168with `the respective ends of the Abar 141. i

` A spring 171, `the respective ends of which are .er-cured to thetiesrod` 172 and ito the trefufiiefiever 156 nornuiilyfholds thetreadlelever in raised'relation, and urgesniovenient oit the har 141away from the stops 151. The-cutting edge 92 normally positioned at itslimit oi movement away `frointhe bed.

It it is desired to operate on a mold, the mold slipped `under `thecutter and clamped to the table. The cutter-support is adjni-zieillaterally by rotationof the handwheel 13B, and, it necessary, thecarriage 'L is moved, by `rotation ot' the hand-wheel `86,

to posit-ion the cutter' at a printing depression inthe mold, the cutterbeing out of contact with the mold. Thecutting 4edge is caused todescend into said printing depres- `sion by depression of the treadleand the height of the cutting edge is adjusted by rotation of thelmnd-wlieel 116, so that the cutting edge just touches the bottom ofsaid printing depression. 1T he cutterslide is then clamped in'adjustedposition. It is to be understood that whilst such adjustment isbeing made, `the slidebar 1111 is in contact withV its stops 151` fordefinitely limiting the downward movement of the cutting edge.

The `treadle -is then released "for raising the cutter out of theprinting depression,

and the cutter "traine is adjusted laterally,

y ce

by operation of the hand-wheel 138, and, it nemessary, the carriage is`moved `by rotation ot the hand-Wheel 86, to locate thecutting edge in aposition at the imprinting portion oi the mold which it is desired toprovide with abearer depression. The cutter-bar 95 is rotatively set byrotation of .the handle 1U() to present the cutting edge in `desireddirection for the direction of desired movement between the mold and thecutting edge. The cutter is then moved into the face side of the mold bypressing on the treadle. The desired movement is then imparted either bythe hand-vvheel 86 for moving the carriage, or by the hand wheel 138 formoving the cutter, as may be desired, or the direction of presentationof the cutter ma determine, or by both said hand-Wheels i a diagonalpath of the cutter is desired. The screwrods 81 and 131 ma have threadsof comparatively high pitch for rapid traverse of the cutter andcarriage` for rapid operation.

Assuming that a path is desired to form a parallelogram 175 in theprinting portion oi the mold, the cutting edge is presented in adirection transverse to the carriage and the carriage moved rearwardly.The cutting edge is then rotated 90o, and the cutter-head movedlaterally in one direct-ion. The cutter-bar is then rotated another 90,and the carriage moved forwardly the desired eX- tent. `The cutter-haris then rotated "an` `the other `90",Hand thecutter-head caused totravel in the `oppositedirection` to complete rallelogranrl It desired,thedepth oficut `may he`obtained by successive settings and cuttings,each removing a portion `ot the thickness of nml-@rial 'for :toi-mingthe depression, `until the depression of `the desired depth.

It is desirable that the area of bearer depressions in the mold shallheigagedhy the density ot the printing portions inthe mold. Thus if theprintingiportions be close or dense,"the bearer portions `in the un`rinting ptn-tions will be madefdense, an ifthe printing portions belight, the bearer por-` tions "in the imprinting? poc-tions will be madecorrespondingly light, to produce uni- -iormity `in thickness intheprinting plate.

The action ofthe" cutter is preferably to remove thee-hips arisiiwfronithe cutting past the upper surface o? `the mold, and the form `of thecutter is preferably such `that sharp outlines of the Wa'ils an bottomof the groove being cut are `orrned, and a sharp upperedge for said*Walls -is provided. It will he noted that the advancing side of thecutter is hollowedadjacen't toits cutting edge, the body of the :cutterreceding as shown at 177 above ithe cutting edge, and then curvingforwardly, `as shown at"178, for ready relief of the `reinoved stripofthe mold. `The sides of thecutter adjacent` to the cutting edge andthroughout the Wails of the groove "formed *by the cutter are sharp, formaking clean cutsiattiie bottoms, sides and upper-edges of said Walls.

Closely adjacent parallel grooves may also` i be cut insaid unprintingportions ofthe mold, as *Well as Jgrooves which merge into eachotherpanid other forms"andirelatiolis of `,f rroovesmay he out, or anydesired "dir-ec tion, `Width or i shape i of grooves or.` corelatimi ofgrooves may be out, as may be desired.

The mold may be clam ed on the carriage with its sides parallel with thesides of the` carriage, as shown in Fig. 17 or said mold may be clampedin any desirable angular position, depending on the directions i inwhich it is desired to cut the grooves in the mold. These `grooves.` aredesir-ably cut parailel with ad3acent printing lines, so that, t

if the printing lines are angularWith relation to the mold, the moldisdesirably angularly clamped onthe carriage.

Then the printing plate `is formed from a mold formed as hereindcscribed,` thev after-formed bearer depressions are reproduced With theprinting "depressionsin the printing plate as bearers and as printingelevations respectively, `of equal height, for

`lio

scribed and claimed the same in a copending application tiled by me inthe United States `Patent Ollice May 9, 1927, for patent on improvementsin method of forming molds for printing plates, as Serial No.

What I do claim herein as my invention and desire to secure by LettersPatent, is:

l. In a bearer cutting machine tor molds having indentations therein'for the printing portions of printing plates and areas of nonprintingportions, the combination of a cai riage provided With a supportingsurface tor the mold, a cutter having a cutting edge which isnon-rotating during cutting and a receding portion above said cuttingedge for upward removal ot the material cut, means tor adjustingtheangle ot presentation of said cutting edge to the mold andmaintaining said cutting edge in such ad justed angular positions, aslide tor si cutter, a pivoted support ior said slide, means foradjusting said slide on said support in a direction transverse to saidsupporting surface for positioning the cutting edge of said cutter incontact with the bottomhotV a printing indentation in said mold on saidcarriage, a stop for said support during said lastnamed adjustment,treadle means for pivotally moving said support and causing approach andrecession between said cutting edge and said supporting face of saidcarriage, and means for causing travel in relatively right angulardirections in a plane parallel with said supporting tace between saidsupport and said carriage, constructed and arranged for entry of said.cutting edge into said arcas ot' said non-printing portions and lineartravel between said cutter and said carriage with said cutting edgc'inthe plane ot the bottoms ot said depressions.

2. In a bearer cutting machine for molds having indentations therein torthe printing portions ot printing plates and areas ot nonprintingportions, the combination of a traine, a carriage movable on said 'frameand provided with a. supporting surface for a mold, a screw-rodextending transversely above said carriage, a cutter-supportpivoted toand movable lengthwise of said screw-rod, a slide thereon, means foradjusting said slide on said support, a cutter on ,said slide, saidcutter having a cutting edge which is non-rotating during cutting, anoperating bar, guiding means between said trame and said operating bar,limiting stops at the respective ends of said operating bar, saidoperating bar having operative con nection with said pivotcd support forpivotally7 moving said pivoted support, treadle means for operating saidoperating bar, means tor rotating said screw-rod and thereby laterallymoving said pivoted support along said operating bar, means tor causingtravel of said carriage at' right angles to said lateral movement otsaid support, and means for adjusting said cutter about its longitudinalaxis for presentation ot its cutting edge in ditterent directions to themold and maintaining said cutting edge in said adjusted positions Whilein the mold.

In testimony Where-of, I have hereunto signed my name. i

LESTER WT. CLMYBOURN.

